V and R are the regime mean velocity and hydraulic mean depth respectively in meters. Lacey's silt factor f is
A. $$\frac{{2{{\text{V}}^2}}}{{\sqrt 3 {\text{R}}}}$$
B. $$\frac{{3{{\text{V}}^2}}}{{4{\text{R}}}}$$
C. $$\frac{{5{{\text{V}}^2}}}{{2{\text{R}}}}$$
D. $$\frac{{2{{\text{V}}^2}}}{{5{\text{R}}}}$$
Answer: Option C
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